Spark control for internal-combustion engines



Sept. v8, 192s. 1,553,082

' J. ISOJOKI SPARK CONTROL FOR INTERNAL COMBUSTIION ENGINES Filed Sept'.20. 1923 `Patented Sept. j8, 1925:.

f JALMER IsoJoKI, or DET'RQHT,

SPARK CONTROL FOR INTERNAL-COMBUSTION :EN(zrIIISl'ES.`

Applcationvled September 20, 1923. Serial No. 663,757.

To all whom t may concern Be it known that I, JALMER IsoJoKi, a citizenof the United States, residing at Detroit, in the county of Wayne andState of 5 Michigan, have invented certain new and useful Improvementsin Spark Controls for Internal-Combustion Engines, of which thefollowing is a specification.

This invention relates to an automatic spark control mechanism forinternal combustion engines.

It is aimed to provide an inexpensive, efficient and durable meansoperable automatically according to the speed of the engine in order tovary the time of production of the spark or firing, that is, advance orretard it.

Another object is to provide a novel means to accomplish the end statedwhich is controlled by a governor.

Various additional objects and advantages will appear from thedescription following, taken in connection with the accompanyingdrawings illustrating an operative embodi ment.

In said drawings Figure 1 is a view showing the device in elevation;

Figure 2 is a sectional view taken substantially on the line 2 2 ofFigure 1, and

Figure 3 is a side view of the timer.

Like reference characters designate like cr corresponding parts in thedifferent views.

The invention is practiced in connection with a timer or commutator suchas is used on automobiles, tractors and the like and a g conventionalform of'which is shown at 10 having a shell or casing 11, provided withcontacts 12 at spaced intervals and which are adapted to be wiped by acontact roller 13 in order to successively close and open electriccircuits through the spark plugs of the cylinders of the engine in amanner well understood. The contacts 12 are insulated from the wheel asat 14 and the roller 13 is carried by a bracket 15 fastened on va shaft16 rotatably mountedV in the shell. The shell is also capable of slightrotary or turning movement about the axis of shaft 16 and independently'thereof.

A governor rod or shaft 17 is journalled and fastened againstlongitudinal movement in asuitable bracket 18, fastened to any suitablesupport or part on the automobile or tractor. Shaft 17 has a bevel gear19 fixed thereon which meshes with a bevel gear 20, keyed on shaft'16.

Slidably disposed on shaft 17 is a sleeve 21, which is in turnslidablethrough a hollow arm 22 of a'bracket 23 adapted for connection to asuitable part of the automobile or tractor. The sleeve 21 is also freeto turn on a shaft 17 and in arm 22.

Rigidly fastened as by rivets 24 to shaft 17 is a V-shaped head 25 towhich elbow shaped arms or levers 26 are pivoted by pins 27. The longerarms of levers 26 have Vballs or governor weights 28 thereon while theshorter arms extend into an `annular groove 29 in sleeve 21. Anexpansive coil spring 30 surrounds sleeve 21, abutting arm 22 at one endand one of two flanges 31 at the other'end, and between which flangessaid groove 29 is provided. A link 32 is pivotally connected at 33 toshell 11 and at 34 to sleeve 21.

In use, shaft 16 constantly rotates whereby the roller 13 successivelywipes the contacts 12 and thereby successively fires the spark plugs ofthe engine in the manner well understood. The spring 30 maintains theparts, when the engine is idle in such position that cranking of theengine will not produce back-fire. When the engine is in motion, shaft16 turns gear 20 which rotates ear 19 and shaft 17. By rotation of shaft17, centrifugal force will throw the weights 28 outwardly from the fullline to the dotted line position of Figure 1, and their position willconstantly change according to the speed at which such shaft 17 isdriven.

Weights 28 thus swing the levers 26 and by their disposition in groove29 to slide sleeve 21 on shaft 17. This sliding movement of sleeve 21moves link 32 and causes it to rock the timer shell 11 and thereby move'the contacts thereof closer or farther from the roller 13 to retard oradvance the time of.y contact and accordingly of firing, according tothe speed of the shafts 16 and 17.

2f i i 'I 1,553,08e

I olaim5 said flanges and said hollow arm, a head on In combination, atimer shell, a Contact said second shaft, elbow levers on said headshaft coacting therewith, a shaft driven extending into said groove,governor on said from said shaft, means mounting the seclevers, and alink connection between said 5 ond shaft against longitudinal movement,sleeve and said timer shell, said spring and 15 a sleeve slidable on thesecond shaft,A a hol; link connection being on opposite sides of low armin which said sleeve is disposed, Said hollow am@ i flanges on saidsleeve providing a groove In testimony whereofI affix my signature.between them, an expansive spring sur- 10 rounding the sleeve andengaging one of Y 1 JALlVlER ISOJ OKI.

